personally i wouldnt do it.
i have a .243 too and for awhile my normal fork, shiver sc, was out on warrenty so i put my 03 super on.
i really didnt like the way it rode, it was really weird, i think it is partly cause the .243 is so short but i hated the way the front was so tall and abosrbing but the back was harsh. it was way to heavy as well i thought. the reasons i like hardtails is because they are so quick and agile, putting a big fork on the front ruins that, get a full suspenison then.
i wont put more that a five inch travel fork on the front of my bike, even if i was gonna ride whislter, i would just take advanatge of my bikes manuvurablity and find new lines, then deal with the fact that my bike would be a little less stable.
a jr t 2 would be the perfect fork for a whilster hardtail imo, low travel but still really burly and rigid. do u have a mr t dual crown? if so there is like no difference. idk maybe i would consider putting a boxxer race in 6 inch travel setting on there but not more travel than that, buy a dually if u want huge travle, they are a lot nicer all around.